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OSHA requires the use of gloves during venipuncture except in those extremely rare cases in which doing so would put the patient and health care provider in jeopardy.
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The answer really depends on the state/province and country, as the laws are different everywhere. In some states chiropractic physicians are trained to perform and interpret EKGs, do venipuncture, perform urinalysis, even deliver babies and perform minor surgeries. Other staes have more narrow scopes of practice. To find out the laws in your state/province you should contact the chiropractic association or college in your area. The related links contains more information from one chiropractor:
A venipuncture is a puncture in a vein. As when a person gives blood or has a blood test run.
You use your thumb to keep the vein from "rolling" while doing a venipuncture.
See the Web Links to the left for more information about venipuncture.
According to CLSI the tourniquet should not be left on for more than a minute. If a suitable vein has not been found, remove the tourniquet, leave it off for two minutes, then reapply the tourniquet to look for suitable veins and/or perform the venipuncture.
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Venipuncture is the medical term used when drawing blood. Basically, it means your vein has had a needle stuck into it for some purpose.
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A tourniquet may be used to aid in venipuncture to make accessing veins easier, or in preventing life-threatening bleeding.